UPD17P136ACT datasheet(39/292 Pages) NEC

39 / 292 page

CHAPTER 3 PROGRAM COUNTER (PC)

Figure 3-7. Value in the Program Counter during Execution of an Indirect Subroutine Call

Remark The shaded part is effective only in the case of

µPD17136A/17137A/17P136A/17P137A.

3.2.4 During Execution of Return Instructions (RET, RETSK, RETI)

During execution of a return instruction (RET, RETSK, RETI), the program counter is restored to the value saved

in the address stack register.

Figure 3-8. Value in the Program Counter during Execution of a Return Instruction

Remark The shaded part is effective only in the case of

µPD17136A/17137A/17P136A/17P137A.

3.2.5 During Table Reference (MOVT)

During execution of table reference (MOVT DBF, @AR), the value in the program counter is saved in the stack,

the address register is set by the program counter, then the contents stored at that program memory location is read

into the data buffer (DBF). After that, the program counter is restored to the value saved in the address stack register.

One level of the address stack is temporarily used during execution of table reference. Be careful of the stack level.

PC9

PC8

PC7

PC6

PC5

PC4

PC3

PC2

PC1

PC0

MSB

LSB

AR9

AR8

AR7

AR6

AR5

AR4

AR3

AR2

AR1

AR0

PC10

AR10

(n = 0 to 4)

Address stack register n

PC9

PC8

PC7

PC6

PC5

PC4

PC3

PC2

PC1

PC0

MSB

LSB

(n = 0 to 4)

Address stack register n

PC10

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